Vibration translating device



Jan. 7, 1936. H. a. HARRISON r 2,027,163

' VIBRATION ,TRANSLATING 021mm Filed Sept. 29, 1934 %AMP E:I us.INVENTOR LL95 I J By 1. c. HARRISON" ATTORNEY riotou 1, 1536 l 2,027,168

. UNlT ED STATES PATENT OFFICE VIBRATION TRANSLATI'NG DEVICE Henry GHarrison, Port Washington, N. Y.-, :issignor to Bell TelephoneLaboratories, Incorrorakted, New York, N. Y., a corporation of NewApplication September 29, 1934. Serial No. 746,073

8 Claims. (c 179-100.41)

This invention relates to phonograph reproted. The magnetic circuit ofthis reproducer inducers and more particularly to those capable ofcludes a permanent magnet l contacting at one playing both vertical andlateral cut records. end a central pole-piece I I and at the other end,The object of the invention is a reproducer of not show t e Outer D -Pwhich a this type which is adapted to reproduce either serves as abottomclosure for the casing IS. The 5 vertical or lateral cut records andalso to give D -P e ll extends downwardly intO- the simultaneousseparable reproductions oi'vertical Stantially Circular Opening in the P-p cut and lateral cut recordings in the same groove. 12 a d s u 'c t dat its o er e d to form two According to the invention the moving systemD p d is o he coi s 1 and 8- Ihe 10 of the reproducer has two generatingelements, D p are contoured to form Short Working 10 preferably coilslaterally spaced andv rigidly'conp 9 and 20 at the Outer Sides of thecoils. nccted to a single stylus. The coils are vibratably The Coils areWOund On a l twe t du a um supported in operative relation to a suitablemag- 0 p 2| W ic has twoupwardly e te t bula net c circuit by aplurality of supporting springs pieces o upp r ing t e 0 8 H an 8 5which permit the coils to move vertically either as Shown more C yPl'ojecting i th Same or n opposite directions depending. downwardlyfrom the center of the cup is a lighton whether th stylus is d i fromvertical or weight tube 24 fitted at its lower end with a stylus lateralcut records. 25. This vibratory system is mounted in opera- Bothleads'dfeach coil are brought out so that tivc relation to t magnetic ci uit y man 0' either coil may be used alone as a universal gencf the pa parallelcantilever s in s 6. 21 crating element, switching means may be prowhichare clamped t t e po e-p e H by a vided for reversing the relativepolarity of the coils Screw so that the outputs of both coils may beutilized The upper spring 26 s p e erably -shaped it eith t of record ort 11 may be and is conveniently made from thin sheet mate- 25, connectedto suitable external circuits to provide rial 50 that it 15 of y lowStiffness for t ca 25 separate reproductigns of tw ream-dings 1n t andtorsional deflections but of relatively high s r rd r ov A ystem of thitt type stiffness for lateral deflections. In proportioning is discloseda d clai d i my copending uthe spring to obtain the necessary high ratioof cation Serial No. 742,761, filed September 5, 1934. Stiffncsscs fordif e t d fl t ns, t is s mc- These and other features of the inventionwill mes advantageous to perf the pr n 26 30 be more clearly understoodfrom the following dewith holes, such as 29 and 30. The lower sprintailed description and the accompanying d 27 should be of low stiiinessfor both vertical and ing in whi h; lateral deflections and theserequirements are i Fig. l is a general view, partly in section, of aconvenintly'met y using a Single r nd o f e reproducer according to theinvention showing wire as shown.

' particularly the vibratory system and its relation e the Stylus 25 isdriven by a Vertical Out to the magnetic circuit; record the springs 26and 21 will both deflect Fig. 2 is a perspective view of the vibratoryvertically, the coils l1 and i8 will be vibrated vertically in the samedirection in the gaps l9 and system; Fig. 3 is a vertical sectional viewtaken as in- 20 and the currents generated in the coils will 0 dicatedbythe line 3-3 in Fig. 1; correspond to the stylus vibrations. When theFig. 4 is a horizontal sectional view taken along t us is dr v y a a a ud. t etthe line 4-4 of Fig. 1; eral vibrations will deflect the spring21 laterally Fig. 5 is acircuit diagram showing a separate but inthiscasethe spring 26, due to its high reproducing system for each of thegenerating .lateral and low torsional stiffness, willact as a elements;and pivot by deflecting torsionally so that the coils Fig. 6 is adiagram of a circuit for utilizing the are vibrated vertically but inopposite directions. output of both generating elements when the As inthe previous case, both coils will generate reproducer is used on eitherhill and dale or currents corresponding to the stylus vibrations lateralcut records. but due to the opposite directions of their vibra- 5ORefering now to the drawing, the structures 01' tory movements thecurrents will be of relative- Figs. 1 to 4 have been shown considerablyen- 1y opposite polarity. larged and the conventional portions of there- If the leads of coils l5 and iii are connected producer in Fig. lwhich are not essential to an to separate amplifiers 3|, 32 andloud-speaking understanding of the invention have b en m tr ceivers 33,34 as shown in Fig. 5, it will be ap- 55 'tions of the stylus.

' 3:111 a reproducer, a magnetic circuit and a i vertical vibrations of.the stylus;v

that either or both of these reproducing systems is operative toreproduce either vertical or lateral cut records. A more economicalsystem for utilizing the output of both coils from either type of recordis shown in Fig. 6 in which only a single amplifier 35 and a singleloudspeaking receiver 26 are used, one of the coils, l5, being connecteddirectly to the amplifier and the other coil being connected through areversing switcht'l. When using "the system for'vertical cut records thecurrents are in the same direction in both coils and the switch istherefore closed to the left to connectcorresponding terminals of thecoils in parallel. When lateral records are used the currents-are'in"opposite directions in the two coils and by closing the switch to theright the connections-ofcoil I5 are re versed so that the currents areadditive in the amplifier input circuit asbei'ore. The invention hasbeen described with reference to a device having moving coil generatingelements but itwill be-apparent that applicants vertically resilientpivot construction for sup porting the vibratory system is equally.applicable .to. electromagnetic, electrostatic or other known types ofreproducer or other vibratory translating device. Variou s changes mayalso be made in the design ofthe device shown but the invention isintended to be limited only by the scope of the followingv claims.

What is claimed is: I Y 1. In a reproducer, amagnetic circuit, a movingsystem comprising a pair of spaced coils in operative relation to thecircuit and a stylus for i driving the coils and resilientmeanssupporting the system between the coils for both lateral and .2.Inc. reproducer, a-magnetic, circuit, a moving systemcomprising a pairofspaced generating-elements in operative relation to the circuit 'and'a stylus for driving the elements and two spaced springs ofdifferentlateral stiffnesses secured to the system between the coilssupporting the system for. both lateral and vertical vibramoving systemcomprising a pair of spaced coils,

a coil supporting member, a stylus for driving said member and means formounting the system with the coils in operative relation to the circuitincluding a spring attached to the member between the coils and free todeflect both vertically and torsionally in accordance with the stylusvibrations.

4. In a reproducer, a magnetic circuit, a member carrying two laterallyspaced coils in operatlve relation to the circuit, a stylm, meansconmeeting the stylus to the member between the coils and supportingmeans therefor including a spring between the coilsifree-to deflect bothvertically and .torsi'o'nally but not in a lateral mode. 5. In auniversal phonograph reproducer, the combination with a magnetic circuithaving two spaced air-gaps and a moving system compris- I ing two coils,means for supporting the coils in spaced relation for vibration in theair-gaps, and a stylus for driving the coils, of spaced parallel springsupports for the system constituting a vertically resilient pivotbetween the coils.

7 6. A moving system for phonograph reproducers comprising 'alightweight cup member having two laterally spaced upwardly extendingtubular coilsupports, a coil on each of the supports, a stylus'connectedto the cup between the coils and spaced parallel springs of difierentlateral stiiinesses for supporting thesystem for vertical andlateral'v'ibrations "of the stylus.

"7. In a'universalreproducer, a magnetic cir-" cuit including two airgaps, a'pair of laterally spaced generating elements in the a stylus,

a member connecting the stylus to the elements,

a vertically and torsionally resilient spring of high lateral stiffnessconstraining the elements to move in the same direction for verticalstylus vibrations and, in oppositedirections for lateral stylusvibrations,'jand means for combining the outputs of the elements inaiding relationship when vibrating in; either the sameor oppositedirections. I V v Bfiln a reproducer, the combination with a magneticcircuit including an outer pole piece 'having'an epertureand an innerpole piece projectinginto the aperture and having furcations definingarcuate gaps on opposite sides of the aperture and'a moving systemcomprising a coil on each furcati'on having one side disposed in the gapand'the other side flattened to increase the spacing between the 00115,a stylus and means for connecting the stylus to the coil'aoi resilientsup Coils. mNRY C. HARRISON.

porting means secured to the system between the flattened sides of the50

